Clock



FIG. 1 is a front perspective view of a clock;

FIG. 2 is a front view of the clock shown in FIG. 1 ;

FIG. 3 is a rear view of the clock shown in FIG. 1 ;

FIG. 4 is a right side view of the clock shown in FIG. 1 ;

FIG. 5 is a left side view of the clock shown in FIG. 1 ;

FIG. 6 is a top view of the clock shown in FIG. 1 ; and,

FIG. 7 is a bottom view of the clock shown in FIG. 1 .

The broken lines illustrate portions of the clock that form no part of the claimed design. 

CLAIM The ornamental design for a clock, as shown and described. 